Thanks everyone for taking the time to reply. The behavior hasn't presented again since those original days, and I'm a little suspicious of my habit of carrying two sets of keys on me--both key fobs. I wasn't able to reproduce anything while pressing or holding buttons or combinations with the car running, but I have suspicions of some buttons getting pressed in my pocket. Anyhow, hopefully this was a one-off fluke, and we'll never hear about it again.
You guys rock.
Time to go out and take the long way to anywhere.
